Heat lightning can also occur if cloud-to-ground lightning occurs very far away and the sound dissipates before it reaches the observer. At night, it is possible to see the flashes of lightning from very far distances, up to 100 miles, but the sound does not carry that far.
Fungal Grotto is a 4-man dungeon in Elder Scrolls Online. It is located all the way at the western edge of Stonefalls.
The numinous quality of the grotto is still more ancient: in a grotto near Knossos in Crete, Eileithyia was venerated, even before Minoan palace-building. Even farther back in time, the immanence of the divine in a grotto is seen in the sacred caves of Lascaux.